rod7515 said: I agree with both Joel and Sarge on the radiator cleaning. If Im reading correctly you have a 72? If so is the original shroud still on the car. These shrouds are critical for the correct air to be pulled thru to create proper cooling. They also need to have the seals in place around the shroud. As for the flex fan take it off as soon as possible (IMO) and go back to an original clutch fan type. I have seen flex fans loose a blade and go thru hoods. Also horror stories of people being hit by pieces when they come apart. As for the electric fan I would think he meant since its an auxillary it blocks air flow from your flex fan. I run electric fans only on my 72 and I am very happy with them. But any fan needs to be properly shrouded to allow them to draw as designed.
P.S. if you decide to go back to an original style fan and cant find one let me know. I have the one from my 72 that I am not using.

Best of luck,
Rodney